import { Directive, ElementRef, Renderer2, HostListener } from '@angular/core';
@Directive({
  selector: '[appModalMove]'
})
export class ModalMoveDirective {
  // public dragDom;
  // @Input() nzVisible;
  // @Input() nzAfterOpen;
  constructor(private el: ElementRef, private render: Renderer2) {

  }

  @HostListener('mouseenter') onMouseEnter() {
    // 此处监听mouseenter 因为需要等dom渲染完成才能取到ant-modal-header. 如果有类似VUE 的$nextTick() 可改造优化
    const dialogHeaderEl = this.el.nativeElement.querySelector('.ant-modal-header')
    this.render.setStyle(dialogHeaderEl, 'cursor', 'move')

    const dragDom = this.el.nativeElement.querySelector('.ant-modal-content')

    // 获取原有属性 ie dom元素.currentStyle 火狐谷歌 window.getComputedStyle(dom元素, null);
    const sty = dragDom.currentStyle || window.getComputedStyle(dragDom, null);

    dialogHeaderEl.onmousedown = (e) => {
      // 鼠标按下，计算当前元素距离可视区的距离
      const disX = e.clientX - dialogHeaderEl.offsetLeft;
      const disY = e.clientY - dialogHeaderEl.offsetTop;

      // 获取到的值带px 正则匹配替换
      let styL, styT

      // 注意在ie中 第一次获取到的值为组件自带50% 移动之后赋值为px
      if (sty.left.includes('%')) {
        styL = +document.body.clientWidth * (+sty.left.replace(/\%/g, '') / 100);
        styT = +document.body.clientHeight * (+sty.top.replace(/\%/g, '') / 100);
      } else {
        styL = +sty.left.replace(/\px/g, '');
        styT = +sty.top.replace(/\px/g, '');
      }

      // tslint:disable-next-line:no-shadowed-variable
      document.onmousemove = e => {
        // 通过事件委托，计算移动的距离
        const l = e.clientX - disX
        const t = e.clientY - disY

        // 移动当前元素
        dragDom.style.left = `${l + styL}px`;
        dragDom.style.top = `${t + styT}px`;

        // 将此时的位置传出去
        // binding.value({x:e.pageX,y:e.pageY})
      };
      // tslint:disable-next-line:no-shadowed-variable
      document.onmouseup = e => {
        document.onmousemove = null;
        document.onmouseup = null;
      };
    };
  }
}
